KR100624258B1 - Blended material and method for manufacturing touch screen linearization pattern - Google Patents

Abstract

The present invention relates to a novel method for manufacturing a touchscreen linearization pattern that is needed in a 5-wire resistive or current sensitive touchscreen and directly affects the accuracy, production cost, and size of the edge area of the touchscreen. Printing a linearization pattern on an edge region of the conductive glass surface using the ink, wherein the ink contains about 59 to 62 wt% silver powder and about 14 to 16 wt% in about 24 to 25 wt% of the contact chemical solvent. It is produced by mixing the carbon powder of, so that the formed touch screen is characterized in that the ratio of the resistance value of the two ends of the linearization pattern and the square surface of the glass layer is about 10.

Description

Manufacturing method of touch screen linearization pattern and its mixed material {BLENDED MATERIAL AND METHOD FOR MANUFACTURING TOUCH SCREEN LINEARIZATION PATTERN}

1 is a schematic exploded view of a conventional current sensing touch screen,

2 is a schematic exploded view of a conventional 5-wire voltage sensing touch screen;

3 is a schematic diagram of an improved first linearization pattern based on the linearization pattern layer shown in FIG.

4 is a schematic diagram of an improved second linearization pattern based on the linearization pattern layer shown in FIG. 1 or FIG. 2, and

5 is a schematic diagram of a third linearization pattern according to the present invention.

* Explanation of symbols for the main parts of the drawings

1,7 glass layer 2: conductive thin film layer

3,3A, 3B, 9: linearization pattern 4,11,13: insulation layer

5,12: 4-wire silver printing layer 6,16: tail cable

8,14: ITO conductive layer 10: insulation point set

15: plastic thin film layer

The present invention relates to a method for producing a new touch screen linearization pattern and to a mixed material used for manufacturing. In particular, a method for generating a linearization pattern capable of increasing the resistance ratio of a glass surface unit square to two ends of the linearization pattern and It relates to a mixed material.

Recently, voltage-sensitive touch screens and current-sensitive touch screens have been widely used in desktop computers, portable computers, or notebook computers. Users can generate electrical signals to perform the desired process, record, draw, select multiple functions, or press on-screen command keys to enter the computer. In use, the computer switches function windows on the screen and the user should not operate the computer through the keyboard.

As shown in FIG. 1 for a conventional current sensing touch screen, the touch screen is generally a glass layer (1), a conductive thin film layer (2), a linearization pattern (3), an insulating layer (4), 4- The wire comprises a printing layer 5 and a tail cable 6 connected with the controller. The controller outputs four identical voltages to the four linearized ends of the touchscreen to measure the change in current.

If different points of the touchscreen are touched, the current at the four ends will have different changes. While measuring the current change, the controller can determine the touched position. A detailed operating principle is described in US Pat. No. 4,293,734. In fact, the design of the linearization pattern directly affects the accuracy, price, and footprint of the touch screen. Conventional linearization patterns consist of separate resistor elements that are connected to the edge regions of the touchscreen to form a resistor network. This type of resistor network is undesirable in terms of manufacturing or final accuracy of the touch screen. Then, a linearization pattern formation method was developed by printing. See US Pat. No. 3,798,370. However, as before, the linearization pattern occupies a relatively large edge area of the touchscreen, and reduces the useful area of the touchscreen. In current LCD developments, the edge area continues to shrink and large linearization patterns will rarely be used in the market.

Conventionally, US Pat. No. 3,591,718 discloses the concept of making a touch screen linearization pattern. However, the concept does not provide a substantial manufacturing method and cannot be visualized at all.

Glass layer (7), Indium Tin Oxide (ITO) conductive layer (8), linearization pattern (9), insulation point set (10), insulation layer (11), 4-wire silver printing layer (12), other insulation layers (13), another type of touch screen (shown in FIG. 2, including conventional ITO conductive layer 14, plastic thin film layer 15, and tail cable 16 connected to a controller). -Wire touchscreen). From the operating principle, the lower ITO is connected to a uniform electric field of 0-5V in the X-axis direction. When the touch screen is touched, the upper ITO layer contacts the lower ITO layer and measures the voltage value. The voltage ratio represents the position ratio on the touch screen in the direction (X axis). For example, 3V indicates that the touchpoint is located at 60% of the total length in the X-direction. When the measurement in one direction (e.g. X-axis) is complete, the controller panel converts the lower ITO into a uniform electric field of 0-5V in the Y-axis direction, then measures the voltage value of the touchpoint in the upper layer and Use the lower ITO layer to measure the position on the Y axis. This can be found in detail in US Pat. No. 3,798,370. This type of touchscreen also requires a linearization pattern to increase accuracy. In this type of touchscreen, ELO's 5-wire resistive touchscreens are the most popular on the market. The linear pattern of the ELO is achieved by forming a resistor network from the separated silver paste and adding or removing portions of the conductive sputtering layer to increase the accuracy of the linearization pattern used on the touch screen. However, ELO touchscreens still have many linearization defects at the edge corners. The removal of the conductive layer also increases the production cost of the touch screen.

Therefore, an object of the present invention is to form a printing ink by mixing a highly conductive material such as silver powder and carbon powder with a contact chemical solvent, and by using the ink to print a uniform resistor line in the edge region of the touch screen, a linearization pattern By forming a connection resistor network which acts as a solution, the above problem is solved by increasing the accuracy of the touch screen and reducing the production cost and the edge area used.

Another object of the present invention is to use other highly conductive metal materials such as copper powder. By changing the relevant material content, the desired coefficient of resistance can be obtained to produce the desired linearization pattern. During material mixture formulation, the size and thickness of the pattern compensates for the excess or lack of conductivity of the material to ensure that the final resistivity of each glass square surface to the two ends of the linearization pattern is about 10. Can be used for

In one aspect, the present invention provides a blend material for printing a desired resistance value to cooperate with existing ITO conductive glass useful in the market to produce low cost touch screens with high accuracy and more area available.

The invention can be further understood by the following detailed description and drawings, together with their numerous advantages.

Referring to FIG. 3 for a first linearization pattern structure made by the method of the present invention based on the linearization pattern layer shown in FIGS. 1 and 2, the object of the present invention is to increase the linearization accuracy of the touch screen. It is to improve the linearization pattern in (3,9).

The resistivity per unit square surface of the glass layer 1 or 7 (shown in FIGS. 1 and 2) to the two ends of the linearization pattern 3A and the uniformity of the linearization pattern 3A are the accuracy of the touch screen. The linearization pattern 3A used in the present invention is formed by a printing technique for printing a highly conductive material on the glass layer 1 or 7 sputtered with a low conductive material or another material. Therefore, the linearization pattern 3A is very uniform. The only factor that determines the linearization accuracy of the touchscreen is the resistivity per unit square surface of the glass layers 1, 7 (shown in FIGS. 1 and 2) to the two ends of the linearization pattern 3A (Ω / sq). )to be. Higher ratios mean higher accuracy. However, if the value is too high, the controller becomes difficult to measure. Thus in practice the value is controlled at about 10 dB / sq. The Ω / sq value of the glass layer 1 or 7 may be chosen from glass available in the market, for example ITO glass from AVCT with 1500 Ω / sq or ITO glass from MERCK with 500 Ω / sq, but is now limited no. The resistance value at the two ends of the linearization pattern can be calculated by the following equation:

Where ρ is the resistance coefficient determined by the material and may be changed by the ratio of acceptable silver powder and carbon powder. L is length, W is width, and H is height. Therefore, the resistance values of the two ends of the linearization pattern 3A may be changed through the control of printing. (Using the above equation once to derive the resistance value and compare it with the used ITO resistance value, the resistance ratio of the glass 1 or 7 and the linearization pattern 3A can be obtained.)

The first linearization pattern structure is formed by printing selected ink on the surface of the conductive glass ITO (glass layers 1 and 7 shown in FIGS. 1 and 2). The ink is made by mixing 62% by weight of highly conductive silver powder and 14% by weight of carbon powder in a 24% by weight contact chemical solvent (or adhesive). The linearization pattern 3A has a thickness of 10 micrometers with a resistance of 0.5 mA / sq when printed. The linearization pattern 3A has a length of 300 mm and a width of 3 mm at each side to form 100 μs / sq. The two ends have a resistance of 100 kW and ITO glass has 500 kW / sq. If the ITO resistance and the linearization pattern on the two sides are formed with a 10: 1 resistance ratio, the linearization accuracy of the touch screen is more than 99%.

4 shows a second linearized pattern structure made by the method of the present invention based on the linear pattern layers shown in FIGS. 1 and 2. The linearization pattern 3B is printed by an ink made by mixing 25% by weight of a contact chemical (adhesive) solvent with 59% of silver powder, which is a highly conductive material, and 16% of carbon powder. When the linearization pattern 3B is printed on the surface of the conductive glass ITO (such as the glass layers 1 and 2 shown in Figs. 1 and 2), it has a thickness of 10 micrometers with a resistance of 1 dB / sq. Have The linearization pattern 3B has a length of 300 mm and a width of 3 mm on each side to form 100 ms / sq. The two ends have a resistance of 100 mA and ITO glass has 1000 mA / sq. If the ITO resistance and the linearization pattern on the two sides are formed by a resistivity ratio of 10: 1, the linearization accuracy of the touch screen is more than 99%.

It should be noted that the example embodiments described above are only choices of highly conductive materials and should not be considered limited to silver and carbon powder. Other metal materials may be used as a substitute, such as copper powder. The desired coefficient of resistance may be obtained by changing the relevant inclusions to form the desired linear pattern. In the process of mixing the material, it is also possible to change the pattern size and height to compensate for the excess or lack of conductivity of the material to ensure that the ratio of the final resistance value of the linearization pattern and the square surface of the glass reaches about 10. .

Further, in addition to forming the linearization patterns 3A and 3B in the above-mentioned edge region, the linearization pattern may also be printed in line form 3C (as shown in FIG. 5).

As described above, the present invention forms a printing ink by mixing a highly conductive material such as silver powder and carbon powder with a contact chemical solvent, and by using the ink to print a uniform resistor line on the edge region of the touch screen, a linearization pattern The present invention provides a method of manufacturing a touch screen linearization pattern that can increase the accuracy of the touch screen and reduce the production cost and the edge area used by forming a connection resistor network which functions as a function.

Claims (6)

In a mixed material for forming a touch screen linearization pattern, A highly conductive material containing silver powder and carbon powder, and Contains a contact chemical solvent, The component ratio of the mixed material is that the silver powder is 59 to 62% by weight of the mixed material, the carbon powder is 14 to 16% by weight of the mixed material, and the contact chemical solvent is 24 Mixed material, characterized in that ~ 25% by weight. The method of claim 1, The component ratio of the mixed material can be changed to obtain a desired resistance coefficient to form a desired linearization pattern, The size and thickness of the pattern is changeable to compensate for the excess or lack of conductivity of the mixed material, Thereby, the ratio of the final resistance value between the two ends of the linearization pattern and the square surface of the glass is maintained at about 10. A touch including a glass layer, a conductive thin film layer, a linearization pattern, an insulating layer, a 4-wire silver printing layer, and a tail cable connected to a controller for outputting four equal voltages at four ends of the touch screen and measuring a change in current A method of manufacturing a touchscreen linearization pattern having a screen, Preparing an ink by mixing about 24-25 wt% of a contact chemical solvent with about 59-62 wt% silver powder and about 14-16 wt% carbon powder highly conductive material; And Using ink to print the linearization pattern on the edge region of the conductive glass layer surface to form a linearization pattern such that the ratio of the resistance values of the two ends of the linearization pattern and the square surface of the glass layer is controlled to about 10. and, The glass layer is made of indium tin oxide (ITO) glass having a resistance value of 500 Ω / sq (ohms per square), The coefficient of resistance of the linearization pattern is determined by the material, is changeable by the change of acceptable silver powder and carbon powder contained therein, and is changeable by the size and shape of the linearization pattern, The linearization pattern has a height of 10 micrometers with a resistance of 0.5 μs / sq, has a length of 300 mm and a width of 3 mm to form 100 squares, of 100 μs at its two ends. With ITO glass having a resistance value of 500 mW / sq, having a resistance ratio of 10 between the resistance value of the linearization pattern and the ITO resistance value at its two sides, The linearization pattern has a height of 10 micrometers with a resistance of 1 μs / sq, has a length of 300 mm and a width of 3 mm to form 100 squares, and has a resistance of 100 μs at its two ends. And a resistance ratio of 10 between the resistance value of the linearization pattern and the ITO resistance value at its two sides using ITO glass having 1000 mW / sq. Touch screen including glass layer, ITO conductive thin film layer, linearization pattern, a set of insulation points, insulation layer, 4-wire silver printing layer, another insulation layer, another ITO conductive layer, plastic layer, and a tail cable connected to the controller In the method of manufacturing a touch screen linearization pattern having the upper ITO contact the lower ITO to measure the voltage of the contact point, Preparing an ink by mixing about 24-25 wt% of a contact chemical solvent with about 59-62 wt% silver powder and about 14-16 wt% carbon powder highly conductive material; And Using ink to print the linearization pattern on the edge region of the conductive glass layer surface to form a linearization pattern such that the ratio of the resistance values of the two ends of the linearization pattern and the square surface of the glass layer is controlled to about 10. and, The glass layer is made of ITO glass having a resistance value of 500 mW / sq, The coefficient of resistance of the linearization pattern is determined by the material and is changeable by the change of acceptable silver powder and carbon powder contained therein, and is changeable by the size and shape of the linearization pattern, The linearization pattern has a height of 10 micrometers with a resistance of 0.5 μs / sq, has a length of 300 mm and a width of 3 mm to form 100 squares, and has a resistance of 100 μs at its two ends. Using an ITO glass having 500 mW / sq, having a resistance ratio of 10 between the resistance value of the linearization pattern and the ITO resistance value at its two sides, The linearization pattern has a height of 10 micrometers with a resistance of 1 μs / sq, has a length of 300 mm and a width of 3 mm to form 100 squares, and has a resistance of 100 μs at its two ends. And a resistance ratio of 10 between the resistance value of the linearization pattern and the ITO resistance value at its two sides using ITO glass having 1000 mW / sq. A touch including a glass layer, a conductive thin film layer, a linearization pattern, an insulating layer, a 4-wire silver printing layer, and a tail cable connected to a controller for outputting four equal voltages at four ends of the touch screen and measuring a change in current A method of manufacturing a touchscreen linearization pattern having a screen, Preparing an ink by mixing about 24-25 wt% of a contact chemical solvent with about 59-62 wt% silver powder and about 14-16 wt% carbon powder highly conductive material; And Using ink to print the linearization pattern on the edge region of the conductive glass layer surface to form a linearization pattern such that the ratio of the resistance values of the two ends of the linearization pattern and the square surface of the glass layer is controlled to about 10. and, The glass layer is made of ITO glass having a resistance value of 1500 mW / sq, The coefficient of resistance of the linearization pattern is determined by the material, is changeable by the change of acceptable silver powder and carbon powder contained therein, and is changeable by the size and shape of the linearization pattern, The linearization pattern has a height of 10 micrometers with a resistance of 0.5 μs / sq, has a length of 300 mm and a width of 3 mm to form 100 squares, of 100 μs at its two ends. With ITO glass having a resistance value of 500 mW / sq, having a resistance ratio of 10 between the resistance value of the linearization pattern and the ITO resistance value at its two sides, The linearization pattern has a height of 10 micrometers with a resistance of 1 μs / sq, has a length of 300 mm and a width of 3 mm to form 100 squares, and has a resistance of 100 μs at its two ends. And a resistance ratio of 10 between the resistance value of the linearization pattern and the ITO resistance value at its two sides using ITO glass having 1000 mW / sq. Touch screen including glass layer, ITO conductive thin film layer, linearization pattern, a set of insulation points, insulation layer, 4-wire silver printing layer, another insulation layer, another ITO conductive layer, plastic layer, and a tail cable connected to the controller In the method of manufacturing a touch screen linearization pattern having the upper ITO contact the lower ITO to measure the voltage of the contact point, Preparing an ink by mixing about 24-25 wt% of a contact chemical solvent with about 59-62 wt% silver powder and about 14-16 wt% carbon powder highly conductive material; And Using ink to print the linearization pattern on the edge region of the conductive glass layer surface to form a linearization pattern such that the ratio of the resistance values of the two ends of the linearization pattern and the square surface of the glass layer is controlled to about 10. and, The glass layer is made of ITO glass having a resistance value of 1500 mW / sq, The coefficient of resistance of the linearization pattern is determined by the material and is changeable by the change of acceptable silver powder and carbon powder contained therein, and is changeable by the size and shape of the linearization pattern, The linearization pattern has a height of 10 micrometers with a resistance of 0.5 μs / sq, has a length of 300 mm and a width of 3 mm to form 100 squares, and has a resistance of 100 μs at its two ends. Using an ITO glass having 500 mW / sq, having a resistance ratio of 10 between the resistance value of the linearization pattern and the ITO resistance value at its two sides, The linearization pattern has a height of 10 micrometers with a resistance of 1 μs / sq, has a length of 300 mm and a width of 3 mm to form 100 squares, and has a resistance of 100 μs at its two ends. And a resistance ratio of 10 between the resistance value of the linearization pattern and the ITO resistance value at its two sides using ITO glass having 1000 mW / sq.

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